Block Tag should default to "pending" and not to "latest" in gas estimation called from within writeContract

[LogvinovLeon]

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• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.22.10

Current Behavior

When sending transaction using writeContract - there is no way to specify - should gas estimation happen on the latest or pending block.

Expected Behavior

Gas estimation should default to pending block as it's a more "correct" environment. There is no way transaction will get executed in the latest block as it's already mined.

Steps To Reproduce

contract BlockHashVerifier {
    function verifyBlockHash(uint256 blockNumber, bytes32 providedHash) external view returns (bool isMatch) {
        // blockhash only works for the 256 most recent blocks (excluding current)
        require(block.number > blockNumber, "Block number must be less than current block");
        require(block.number <= blockNumber + 256, "Blockhash unavailable for this block number");

        bytes32 actualHash = blockhash(blockNumber);
        assert(actualHash == providedHash);
    }
}

If you estimate gas for this contract setting blockTag to latest - it will fail. But it will succeed with pending.
There is no way to configure it from the level of writeContract, so a good default will help

Link to Minimal Reproducible Example

No response

Anything else?

No response

[hiendaovinh]

As commented in the commit antazoey@530f0f1

Change the default behavior from latest to pending causes a lot of breaking changes. So I think we can move it to another major version or introduce a fix to configure it when calling writeContract?

[jxom]

Hmm ok, I will revert for now. PRs welcome to add a parameter in.

[hiendaovinh]

Thanks for your understanding.

[github-actions]

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If you found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest Viem version. If you have any questions or comments you can create a new discussion thread.

[jxom]

We have introduced a client option for this: https://github.com/wevm/viem/blob/main/src/CHANGELOG.md#2330